1. Understanding Conception
... over it. The next step after implantation is the secretion of hormone, at this stage, the outer cells of the blastocyst secrete the hormone known as hCG (human chorionic gonadotropin. The next stage is the formation of placenta and the fetal membrane. During this stage the blastocyst develops two fetal membranes, the chorion and amnion ... the first trimester, the brain, spinal cord, and central nervous system is formed. Around six weeks or so the baby's heartbeat can usually be heard. During the third month or so your baby is fully formed; arms, hands, fingers, feet, and toes. Reproduct...
- Word Count: 1309
- Approx Pages: 5
- Has Bibliography
- Grade Level: High School